四川会理拉拉铜矿找矿预测模型构建与找矿示范  

Construction and demonstration of an ore prospecting model for the Lala copper deposit in Huili,Sichuan

作　　者：陈辉[1,2] 林鲁军 庞振山 程志中[1,2] 薛建玲 陶文[1] 马一行 龚灵明[4] 申红涛 CHEN Hui;LIN Lujun;PANG Zhenshan;CHENG Zhizhong;XUE Jianling;TAO Wen;MA Yixing;GONG Lingming;SHEN Hongtao(Development Research Center,China Geological Survey,Beijing 100037,China;Technical Guidance Center for Mineral Resources Exploration,Ministry of Natural Resources of the People's Republic of China,Beijing 100083,China;Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China;403 Geological Brigade of Sichuan Bureau of Geology and Mineral Resources,Emeishan 614200,China)

机构地区：[1]中国地质调查局发展研究中心,北京100037 [2]自然资源部矿产勘查技术指导中心,北京100083 [3]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [4]四川省地质矿产勘查开发局四〇三地质队,四川峨眉山614200

出　　处：《地学前缘》2021年第3期309-327,共19页Earth Science Frontiers

基　　金：国家重点研发计划课题“深部矿产资源三维找矿预测评价示范(2017YFC0601506)”;国家自然科学基金项目(42002102);中国地质调查局项目“矿集区矿产调查及深部找矿预测(DD20190570)”。

摘　　要：勘查区找矿预测理论与方法体系是基于全国129个典型矿床的深入研究,以及在勘查项目实践验证基础上总结而形成的一种特别适合生产找矿第一线使用的有效方法。该方法以成矿作用内因(元素的地球化学特征)和外因(地质作用类型)相结合的思路,构建以成矿地质体、成矿构造与成矿结构面和成矿作用特征标志为主要内容的找矿预测地质模型。四川会理地区位于扬子板块西缘,区域成矿地质条件优越,经历多期构造事件叠加,形成了一系列独具特色的铁铜矿床。近年来,在拉拉铜矿的深部及外围已取得了重大找矿突破和进展。本文以会理拉拉铜矿为典型实例及深部找矿预测成果示范,阐述该方法在深部找矿预测中的具体应用过程,得出了如下认识:早期成矿地质体为赋矿火山岩(河口群钠长岩类),成矿构造与成矿结构面主要为基(中)性火山岩与沉积岩的界面及可能的喷溢口;热液叠加期成矿地质体推测为深部隐伏岩体,成矿构造与成矿结构面主要为褶皱、断裂和裂隙。在总结成矿作用特征标志基础上,建立了拉拉铜矿勘查区找矿预测地质模型。通过与地质和物探方法相结合,圈定红泥坡南部为找矿靶区,经钻探验证,发现厚大矿体,打开了区域找矿空间。The prediction theory and methodology of ore prospecting were developed from an in-depth study of 129 typical deposits in China.The prediction method was verified to be effective,especially for initial ore prospecting.Using this method,a geological model of ore prospecting can be established by combining the internal(geochemical characteristics of elements)and external(types of geological processes)control factors for mineralization.The main components of the prediction model include the metallogenic geological body,structure and structural plane and the characteristics of the metallogenic process.This paper takes the Lala copper deposit in the Huili area,Sichuan Province,as a typical example to illustrate in detail the application of this method in deep ore prospecting of hydrothermal deposits.The Huili area is located in the western margin of the Yangtze Plate,where the regional metallogenic geological conditions are superior and a series of unique Fe-Cu deposits were formed due to the superposition of multi-period tectonic events.In recent years,great prospecting breakthroughs and progress have been made in the deep and peripheral areas of the Lala copper deposit.In this paper,we determined that the early ore-forming geological body is the ore hosting volcanic rock(albitite of the Hekou Group),and the main metallogenic structural control is the interface between basic(intermediate)volcanic and sedimentary rocks and the possible volcanic vent.In the period of hydrothermal superposition,the metallogenic geological body was speculated to be a deep concealed intrusion,and the metallogenic structural controls are mainly folds,faults and fissures.On the basis of summarizing the mineralization characteristics,a geological model of ore prospecting in the Lala copper deposit was established.Together with the results of geological and geophysical explorations,the southern part of Hongnipo was delineated as the ore prospecting target area where a thick,large orebody was later found by drilling verification,which opened u

关 键 词：找矿预测模型 勘查区找矿 四川会理 拉拉铜矿 找矿示范 

分 类 号：P612[天文地球—矿床学] P618.41[天文地球—地质学]